I was testing the D5’s auto focus trying to capture the pipeline swallowtails flitting among the blue dicks and other spring flowers on Yankee Jim’s Road the other day. I wasn’t entirely successful but these were the best of the group. I had the camera set to high speed crop with the 300mm lens. Although the butterflies were at different distances from me on the flower covered hillside, they look the same size because for some of t he shots, I attached the 1.4X teleconverter so instead of 300mm, the focal length was 420mm. None of the shots is cropped.